Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9263cd5ed3ef0ab3413bfe257332709cfb4396fa9fecdb74839e0a5c9f56dd5' 
  AND token = 'mpVATKnYfQ5DF7pa+ey3fvQrgYzVHe64Xkew4K13rAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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