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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4af30a2354ac7313a1ff77c276a4fd473906e324a77b842e0d85d2faeefcf691' 
  AND token = 'VLGat9SnCOFD68jnQMbuhalttWHVphHhfQiP30L1fAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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