Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a5416d571ddb891be4b0fc5616cd7aa57f1f8ac329f8d0cf9d5b69c3641994' 
  AND token = 'OAahk4p9YdlbdvU2/UawVaGL5HtgBQhG5MQczCtNkEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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