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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9fc335f614618c9c438c13541db460b5d39d59c6b9f639861833bdbcd1f6b2c9' 
  AND token = 'x6Xo9ZYqh7XJj7UD8ROQspA7WrUB+teO5PuLabi6GU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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