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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fc354e9b1bec6dfd215935b12b501eaa5ebdaf0664be6299a7317dc00d0b1657' 
  AND token = 'jGL/px7S3JMGpm0r/UvPN2jzq1MYs6sqAyNqZPZMxkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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