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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '884dc2bfcbd0d930230239ae6ce54ebf9a9369636046f2f93fb22d464f1ad824' 
  AND token = 'JThyk+8y4yk+skl+jgR7VkFkioNcD86rz5nJxXWywp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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