Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d01c68d3a44dd2b589d7a8703a7d782fd503a070fb6c027ee18d9f59098390' 
  AND token = 'L7MC9GtVpKuFTNsuS7uMfjh3Rt/UuMa/F3UT1aFhv2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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