Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea15722f93967b796335362427b48076fee67e097d6c894a015c1fbcc545b788' 
  AND token = 'g4cQ18k6TkTMkHqiLHaqY8+gUDre0kXF2z9vbRM6GoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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