SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '03559af65c3058c4fc814d0e4b03aa7c780de2859799062e191b3ba5761b1f49' 
  AND token = 'DhuzA9SdOk7bCbIg9VEiRvfWxyyGpX/gxhbCNrqOsKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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