Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a082aa83b0da0b2ace06087a5f240d068013aab697784969c75e271e22163e5' 
  AND token = 'SxDMqFd97rQ4t7kDNqX+7FefRD983wAzDadNWg9s3Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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