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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd00b79ed48e96a00cc00e5e6b2c15aec18f15ce83e415d964944a6243e4ce7c9' 
  AND token = 'KIvFM+zuIkTF001E0DplNGkVNUedaucAiGkViBjH0TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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