Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7395486aa55a75b4ebaa002219ea0619b33f41aee393e9c52d49e1c38896ba' 
  AND token = 'IsnXNn7Pc3Av0B7+DuX1xEKpFV21/KR5BK9+APJhscs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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