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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '151a8eff7425955728c8cf6c58d9a93ec2be8365eec6e268db677fec3940358c' 
  AND token = 'YnGkTG9Oq8S9dnGuFV4d+JktQR7gY0z5bIsXgVtes6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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