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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f61ff1c82ac8ba388de0d98e20f7f5241f969eea68423e36dd5b311811ed17d5' 
  AND token = 'cTXZMX+/GNaie001MLqjD2MZRHi5iawdkUf3OqHjyfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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