Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2cf64c481e60ddf46a6a1170636dde87a3c172e4a1a5a53f1eb300fd950d7ac' 
  AND token = '6PgvXDNwZUVbfFkVL4OVETyeJ92H3I1LbK2Hrk/tDGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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