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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7bf82309525e14757a4fd13f25d263721929cd33eced341d5168ff83a25543e7' 
  AND token = 'JOQiykNNlhkxsk0Xko6B2WR5wVnRQ8EiNrbl+S3d5zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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