Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd117aa8af8134cd5eb575324ff0b9609b45475359bf46a7c2e1f7dd0c5b55d47' 
  AND token = '6Z/Bijdo8P9fiuFmph1K6k1GcK0UpqAWQOpcaD1VxPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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