Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5e11aa73a79bf58814665e49361c502c590fea012983ded03eb355dfe1d48f' 
  AND token = 'NYBdIWBS1EuolS1u4EjeCyImMr+ga7yGBZGo8CPwJro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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