Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc49c6d2ac84504aa7e9f2347b9404aa46a2d13f1892dad97625d0a06b2a3fc2' 
  AND token = 'M6YkvkHbH9ib1V8CynzdiMGs1lVxal2DTYktrL4fHyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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