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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '95892e16ff86925e39a4b9e6310bef48bcb3681ae9862b413bf53409c75e63fa' 
  AND token = 'l98GmCA7xQd9XqchSYdXY7YTIHhZMH02FH7w9zit7K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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