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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7177ddd4a45d515c5faea57b27afa1b1bd0dbf9988eaa2e0e9230286c98d8b77' 
  AND token = '6jkINNaOE7fgdjmZHEViYBalqEU7MMp99zLw6z+UxJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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