Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7760bce5d0d77eec4dec91617dae2bbfded8b02195d297efb2f537f3b85c719b' 
  AND token = '3cgX87pNSPPJia+AlHlHclIyXRPitYqBkUVNnqcQh5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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