Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9873bb615fb099b0140a471ce578e7f8e202eaf11e55f472498153a7604a647b' 
  AND token = '3SV3JE2OJdgu7mDHdQzN2xM20X7//BZeDVaIwjb08L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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