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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e53e36dd73bb50a47448361e1d38d31db46af0fb16a3d1f49d8203c1578b68cf' 
  AND token = 'Q26TbfvFihD+VKBeiyEv8E5M6kTfPU5BA5VKMwxjoPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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