Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262cbfc28114797bb7b89851d2f7a02c6ad86fa0601e1896c04bac5599fcdf7d' 
  AND token = 'UDubtD1UqRlOyJo1SG22GReT/iEznMIIK2OQfe386w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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