Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37bdb785ba02bcbd537ef84c1234f8ed4d122e3524a3f8c35f7a7e10e48badd' 
  AND token = 'AKS4o4qax77+BCBmpe7BjnPwryfAKOSD5wZxO+53CTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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