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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dd4d36b1a17d40beab3be62e2a30750be185ca7db199636b647a354aa337031c' 
  AND token = 'DDtGrLkhIiP4OcYUkQtgUqjm9sOE9i1fVQgD5co0B64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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