Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42c69f744347a1dc82cf3150e62511d2fdc5e84bea710c930a4db30f0b1dc90' 
  AND token = 'P4JIDiobBA44ASUK1ZFrcu5Eo2e6cYswDiN5QWkQWCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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