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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '26fa56d6b73b7da21bdc0157064ea881b1a6447e28ead5ba4068caad774f22d2' 
  AND token = '9STv1xDoYs554hBZsdiHvo1By7l2kgY9nH6IDKZGyik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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