Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff6878cf8c07a946d65307575156a45bf86bd5d9b3afc3ad8f010c05082f941' 
  AND token = 'oNP2WMouw0d6JYcds3crZ5sAj8HuIas5fL0qm4ik5Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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