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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '14f1bb0d4c9e13cabc041ecc6caf9865837e2b23db0e11c50b98260466b29e83' 
  AND token = 'sSxjc7HkCdTiTb8uLWB/cJo7RZo8/4ITLGQasnTuk5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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