Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ff75598699e1277e571af26bc278b0c2c263fa765bd0f93dfc63e00cb8def7' 
  AND token = 'UsjWiXvmA0KsXQNWscmNDslsUsiY15ufRbWSdRqb4b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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