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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cc464a429ca21bc5fbd7905c768fdddd2ce670c15fd73154d4b76a99fb2c358b' 
  AND token = 'oJtc+o8GT9PIGWNBDEN50+y/LlVufnZ8p4XjQ8bQlRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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