Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7f1acfab0e3ca1de0582ce1947cec69dfec3154af34cd40a9026ea307b692a' 
  AND token = 'xXU/u+kDr4FnoNgKNZuxQQqWvouRIDFlBHIzqqkpEzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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