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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e5a179fb3526dc497b06fae4708b6ad481583bf151e7554a18e07cdceaba7cfc' 
  AND token = 'RJ5xpGURssywG3G/i3FdzuT8IzgOUImewVvHlXFyWR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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