Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc78e060cdf6a514592685418746c84a6cbe6fce9cbacaefcb8c00b3bef937a9' 
  AND token = 'ne6MyX58gcnVcRJ6iz4NOTHltpt9diWB9FgbTAb5hNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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