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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '176fab67fba19d553a3bd1cae75508493de9b48c43cec1556b9a46d42d202265' 
  AND token = '9n1+IaNUUbWq7mUMKflBIVe6iv/B8vlPdI2DBek7pF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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