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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fe90f0e8f1cdc5b739b1bfdb23d62c593cd9469a84420d503ef9023cf99e494a' 
  AND token = 'ZLvp9lYrKQF+An60EO9zbojWU7cwH8IdWktuys7emhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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