SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f614f23482348c4df6521ec9ac11da3946b58f21a17e62327b730e87daec4b0f' 
  AND token = 'rxBI6ugnKupjMOShY+tDV5Z+Hyfm843dTVLdVTyFdTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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