SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '35d5b44cbb6d10fc200f5e172609d31fc12603f893740bdfa02882025a107569' 
  AND token = 'y2bdfomlkwL/0wLUBpbe+RgCTrGkL+vXmUjIg7TzYNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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