SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e94e6cefae6934d234a1d76e75bc825289d34a869aa7536bf2b500671fe99d24' 
  AND token = 'jqWWWZFrLQ8zd+4iLXKZ/uJKWLm3L8Cin2BwUYZIBiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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