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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8b7fdfb1eb1c4ef83a396766d54ff3fd1cb88be07b7217b0c9d22ef31f164a6d' 
  AND token = 'RG60EurjmIPeHei3H15x4byCCm25mq5qwWzBO7gC5T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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