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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e28c8b3ec71b1bc0ff2340a33564707daf9a3117e39c504202634e1f4453b9cc' 
  AND token = '1vNW/MSPuR7tkGtybMfhkh++lUHr3tmtEFrTmAfh6YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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