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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8ef640dd3508005b85b407aa2e0656440e64e8ce8d4bae51de25f3595dd37378' 
  AND token = 'vh2eBB7hQzb/gaZR58Y0/xHXqWIzzQtUHBjT8NIq3AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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