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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1b46bdb4a88003a7a8ad9832c4d7d9953b60620f5da954aa1066786fa06a1c60' 
  AND token = 'ChoEZmNFSFuaQWbQUpIHp9Z19/4/QeYtfO9mc+xMw4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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