Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca80ec4ce2efeb62e54fb7ae6ed0f69bce89769a9f2f57e03b5b4684a082995' 
  AND token = 'hqJUM3AsjCvcqLlWpNn1m7b3EAqIHNaYsrR6d4LEcVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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