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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b2ffaca6b0e756520f67ff6bfdd2f8d50ea3531e984fca096d17b29b74eef31b' 
  AND token = '8bvC9JwmPiMhu0BXEyfaZYSxUh0Dug8mP42iWQSgW0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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