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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3d16643e13b21816966423505799ba601cd8d69cb576a8c08d28006299e70563' 
  AND token = 'eBhF8S+9yRmA+GUA/bl4VBL/PJHoskQ2N3zEUIC89vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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