Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d6526b586be04d62cf7dc054536469b88d06b38c371e4f627762eaf1898094' 
  AND token = '5VtP0dYY/enQNm4kICabxJyrJCIZCCngZNeF3S9YmVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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