Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a516b28177c340a61c950c31cd668c2b0cbeb35a0548430b4daf4d1a5a0c91c' 
  AND token = '6bWMIz2op861PF4S2u3NUbsuorQnxLBnzZ4rKKYnNd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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