Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd8cc5f2f36ea922122bc0e62782289f2e048034d3bcb51d93fd056e440c9ba0' 
  AND token = '6MbcSouEO5BWKexjdpFDqvFnfX92O1FRwluP6c5dT7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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