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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7ee3cc7ec41b7e7114d49bbcf259c1be6b1b3b3d4a55114602c7be30ec03dd49' 
  AND token = 'CVyLhlSO8jEUXRYzbsfej/lNWjSGj9CHhFes+aeaSSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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