Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71bc66fc13aea376fafc81dcf3d2f025e1d772a411b936729de321d89d0dfb7' 
  AND token = '+NthlAMgjsMNcLLUZc9ESoVvYQZ5JRuDMi1qpL9utd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}