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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ddeb694a9ecd137aba8c839365936effb24d3ef86695bbaf0566253b8e1dca4e' 
  AND token = 'WDP3NdhXh+d6OSo2OoahmC7mnlXqAj4fSGjzB00t0wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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