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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7ebbb938f16cd76f96b52b469d35cee06815ce82a15179def43e7f36de7d75c0' 
  AND token = 'Jx8DqAMAdASj2npUlliY2z11Olxhw5RkgWSvXGeQaAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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