Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e98ddd35dadf5fd10395dd20c8f0e8d7baab3a15a50376c72a8614f2691d075' 
  AND token = 'M3Vj+f6RVZUUcrwTzNTqZYyEapA+Lg2Cm4qbxDHCDco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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