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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2bdf6136722ea954da261a185ce4e10d829cb2709d2dae83f9ac5384ce4e935b' 
  AND token = '2KgtGr1Nitmngk9f+ebg4Rok7LGOfRZ3dqL6hl/NErk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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