Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6177f46a4a10bbbdc1fce68040797f8b1dac16d0495fafdee58476d356c97cc' 
  AND token = '7HpTqsHVeIrM3h/WrKkyLpbdfgokqUISQKDL2+eL0ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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