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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '0655a9a74e17249936a259b12d52c9755430a43b668c5ebc8cfdda6651dbdd9b' 
  AND token = 'yhR/aEe68zn/Io3dxNxcQoqInixlsQUNpYiHg2mMCSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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