SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '06f1d22f7fdb196d2d9f17e34900d3d6d19a4280343372cc4786375e5127eeab' 
  AND token = 'RCwBmI2RqRMMk3Ff75sn4DWGtkjCTbCK/3hxNzW+zcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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