SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '279e3625df394d45351a73c434b6035af958c2cfa80f0d15f2f1066bd88a66ac' 
  AND token = 'vfkdkTpjlPZvy0INFw+ZybBz+JHF1C07hXlAffZ8zfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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