Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792f62e52061afd308ff2098d4606ecb9a0703bdf8b2664f18523c3ebccb860a' 
  AND token = '8qf7/ohpsTtbdx3utEz2YUAjutvaiLyc28tg6PPt9+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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