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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4864f3d15226b571573f260d39c70173ae388fd1a1bef65471b676e62e935e97' 
  AND token = 'pUzdtSkEbMc0FBAzt90F1D6EsuWrAo6I6D9wkBp0omw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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