Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d8be189601c196583305b7ac66201b5d3a97200b617ca2345a22ec9ff40123' 
  AND token = 'blOmPn5RLYFY75Cz2HE4/zr8SFQN95T0CPYeZpWupkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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