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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '469bcb268554e711512dea3bdc5227f1665f02a2e1f4d1c2df556bd379668c59' 
  AND token = 'nI9P54ce5WqHXifXklwXdzZVAg7KlKsIUqO7NnMUzK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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