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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '238f098ec4321cac48bb99cddf8af753230e718790906f2ae5026203f31a0c9a' 
  AND token = 'w4h9MPBEgFENm9hO2TT8OafaCbslbjfHnIHOkttZ+4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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