SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'be6aaa995702ccd5be234481148b7c8706c314be790a1da344723d9300eb7948' 
  AND token = 'bWrItz+GZKXfYSRVCqYhueUraNTYBVykAAsMUDsU6G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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