Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88c957dbd85b495c02b9603375f7db2012c500885773f8bc20cab044836e677' 
  AND token = '4i6Xq6PPtyiQ3Mni89m+mPs3yDlePgbrlNTYzJYmTYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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