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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ab3622c765469eafb6a81a3aa3b1cdeb6e01a8d5482b98bdf8a211098606cf89' 
  AND token = 'qxQU3k9YflmEy1SPlfmtyrDBB6Ul571dbFMvC63r47s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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