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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7184a6c63d9985b748fd5198326f016c1e01134d4e0053b9a603be4396c159f9' 
  AND token = 'Xl9z63BtVUMjbFrC7JBNLb5UdN06wMLSeyjwHApI0N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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