Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c627b36c52f716e96c9f58dab7c1e7e1bb8ba1a1f457301d4895521e2259a6' 
  AND token = 'KNUiTpigVNv5MI5y5+Z6Qen1X9gV8k0PWzA/QufsKW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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