Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e1c4640ba2940f97f4c38d465a2df963ab13283e4a35d654cd11d4012ce3f6' 
  AND token = '5UFaHDpo4xk2Hp+YaOaE0+5/5PTE534U4lRfjesuaMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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