Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce3c4668ec4e2dbd570ceeef45c427da703cd2f2c07f2a2169bec24290e65c5' 
  AND token = 'jBXo9z8auFUfve6wiDUc5fMvf1JrKisPE/5D1dmgRdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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