SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '62d32f877f00277036d12de342e19371300a5976ddedd167579e97b9fd7d21af' 
  AND token = '9HvuhFBa9+G9V/8PAqBEQV1d9LapwVgs8JhjaPvTAOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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